3-Pack .357 Caliber / 9mm Brass Bore Brush

In stock

SKU: BR-0001-357-p3

3-Pack .357 Caliber / 9mm Brass Bore Brush

Product

3-Pack .357 Caliber / 9mm Brass Bore Brush

In stock

SKU: BR-0001-357-p3

$5.70

$5.53

Packs

Available Options

.22

$2.50

.357 / 9mm

$1.90

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One of the most common questions in handgun cleaning: "Can I use a .357 brush for my 9mm?" Yes - and this is that brush. This .357 / 9mm brass bore brush fits .357 Magnum, .38 Special, .380 ACP, and 9mm pistols because they all share nearly identical bore diameters. Phosphor bronze bristles remove carbon and lead fouling from your barrel without scratching.

The 9mm is the most widely used handgun cartridge in the world, and .38 Special / .357 Magnum remain among the most popular revolver rounds in the US. These calibers see high round counts - range sessions, carry practice, competition - which means carbon and lead buildup accumulates fast. Pistol bores are short compared to rifles, but that doesn't mean they need less attention. Fouling in a handgun barrel affects accuracy and can impact reliable feeding.

This pistol cleaning brush works with any standard bore solvent. A few passes after each range trip keeps your handgun running clean. Replace the brush when bristles no longer grip the bore walls - simple gun cleaning that covers four calibers with one bore cleaning tool.

Caliber:

.357 Magnum, .357 Sig, .380 ACP, .38 Special, 9mm

Product Type:

Bore Brush

Firearm Type:

Pistol, Revolver

Use Case:

Bore Fouling Removal

Bristle Material:

Phosphor Bronze

Core/Stem Material:

Twisted Wire (Brass)

Bore Diameter (in):

0.357

Thread Size:

8-32

Pack Size:

10-Pack, 20-Pack, 3-Pack, 5-Pack, Single

Country of Origin:

Imported (China)

Brand:

GUNNIX

Can I use a 9mm bore brush for .357 Magnum?

Yes. The 9mm Luger has a bore diameter of 0.355 inches, and the .357 Magnum has a bore of 0.357 inches - a difference of just two thousandths of an inch. Bore brushes sold as ".357/.38/9mm" are designed to fit all three. The bristles flex enough to clean both bores effectively with a single brush.

Is a .357 the same bore size as 9mm?

A: Nearly identical, but not exactly the same. The 9mm bore diameter is 0.355", while .357 Magnum and .38 Special are 0.357". Bullet diameters differ more: 9mm uses .355" bullets, while .357/.38 use .357" bullets. For cleaning purposes, this difference is negligible - one brush handles all three calibers without issue.

Will a brass bore brush scratch my pistol barrel?

No. Phosphor bronze is softer than the steel in any modern pistol barrel, whether it is a Glock's polygonal rifling or a Smith & Wesson's traditional rifling. The bristles scrub fouling without contacting the bore hard enough to leave marks. Replace the brush when bristles flatten from use - the barrel outlasts the brush by orders of magnitude.

Should I use bronze or nylon for cleaning my pistol?

For 9mm and .357, bronze is the practical default. Pistol cartridges like 9mm and .357 Magnum leave carbon and lead fouling that nylon bristles struggle to break loose. Bronze bristles cut through it efficiently. If you shoot jacketed ammunition exclusively and use a copper solvent, run a nylon brush during the soak to avoid false color readings. Otherwise, bronze is the practical default.

Do I need to clean my revolver cylinders too?

Absolutely. Revolver cylinders accumulate carbon rings at the front of each chamber, and the gap between cylinder and barrel collects burnt powder residue. A bore brush sized for your caliber can clean the cylinder chambers — push it through each one with solvent. For the cylinder face and forcing cone area, a utility brush or old toothbrush works. Neglecting the cylinders can eventually cause sticky extraction and timing issues.